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SubjectRe: BUG: unable to handle kernel paging request in z_erofs_decompress_queue
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On 15.12.2022 14:58, Tudor Ambarus wrote:
> Hi, Gao, Chao, Yue, Jeffle, all,
>
> Syzbot reported a bug at [1] that is reproducible in upstream kernel
> since
>   commit 47e4937a4a7c ("erofs: move erofs out of staging")
>
> and up to (inclusively)
>   commit 2bfab9c0edac ("erofs: record the longest decompressed size in
> this round")
>
> The first commit that makes this bug go away is:
>   commit 267f2492c8f7 ("erofs: introduce multi-reference pclusters
> (fully-referenced)")
> Although, this commit looks like new support and not like an explicit
> bug fix.
>
> I'd like to fix the lts kernels. I'm happy to try any suggestions or do
> some tests. Please let me know if the bug rings a bell.
>

There's something else that may help. I enabled CONFIG_EROFS_FS_DEBUG
while at
commit 2bfab9c0edac ("erofs: record the longest decompressed size in
this round")
and I got the following: https://termbin.com/4bm8

Cheers,
ta

> [1]
> https://syzkaller.appspot.com/bug?id=a9b56d324d0de9233ad80633826fac76836d792a

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